Custom Resin for Medical Application

Does anyone have experience printing polyvinyl alcohol or polyethylene glycol from a resin?

I’m trying to print a hydrogel material and have experience making it in a castable container, but would like to change the process to a resin that can be 3-D printed. I’m not sure what photo-initiator to use with these materials to make the hydrogel.

Thank you very much for your time and assistance!